iMac not turning after power outage during update.(MacOS Sonoma)

Hi... I have a mac from 2019 and it works perfectly and very smoothly without no issues.. i have used the orginal cable and still am using... I always update to the latest OS.... Sooo today I was thinking of doing update and study .. i got exams at 26th of this month... So i already downloaded the update and only had to restart and install it... So I did that and it rebooted...so during the update loading screen... As unlucky as it may sounds....the power went out.... which sent a shiver in my spines as i have very very important files and documents.... So I am really freaking out right now... I am not able to turn it on.... There's no sound... There's nothing on the screen... No apple logo... No mouse cursor.... nothing.... If anyone would help me out... Pls reply fast......... I really don't want to lose any data or files

Pls...........btw i was trying to update to the latest Sonoma security patch update ... I think 14.3.1 (not sure)